Dear Robbie,  Here I would like to present you a video on YouTube
that my friend Thierry has made around his DEA Vorsetzer, which
became the fourth and last DEA Vorsetzer I have restored.  I have
restored the main parts except furniture and some regulations at
the piano.  I didn't have any piano in my workshop at the time.

https://www.youtube.com/watch?v=fjOSVpNkges 
Hupfeld DEA Vorsetzer, Harold Bauer, Etude en forme de valse
Piano Steinway 146 cm (57.5") Model I(?) (ca. 1900-1905)

It's a unique video about this unique instrument.

Best regards from Senneville, France,
Douglas Heffer